src/mesa/state_tracker/st_draw.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/macros.h"
  36
  37 #include "vbo/vbo.h"
  38
  39 #include "st_context.h"
  40 #include "st_atom.h"
  41 #include "st_cb_bufferobjects.h"
  42 #include "st_draw.h"
  43 #include "st_program.h"
  44
  45 #include "pipe/p_context.h"
  46 #include "pipe/p_defines.h"
  47 #include "pipe/p_inlines.h"
  48
  49 #include "draw/draw_private.h"
  50 #include "draw/draw_context.h"
  51
  52
  53 static GLuint double_types[4] = {
  54    PIPE_FORMAT_R64_FLOAT,
  55    PIPE_FORMAT_R64G64_FLOAT,
  56    PIPE_FORMAT_R64G64B64_FLOAT,
  57    PIPE_FORMAT_R64G64B64A64_FLOAT
  58 };
  59
  60 static GLuint float_types[4] = {
  61    PIPE_FORMAT_R32_FLOAT,
  62    PIPE_FORMAT_R32G32_FLOAT,
  63    PIPE_FORMAT_R32G32B32_FLOAT,
  64    PIPE_FORMAT_R32G32B32A32_FLOAT
  65 };
  66
  67 static GLuint uint_types_norm[4] = {
  68    PIPE_FORMAT_R32_UNORM,
  69    PIPE_FORMAT_R32G32_UNORM,
  70    PIPE_FORMAT_R32G32B32_UNORM,
  71    PIPE_FORMAT_R32G32B32A32_UNORM
  72 };
  73
  74 static GLuint uint_types_scale[4] = {
  75    PIPE_FORMAT_R32_USCALED,
  76    PIPE_FORMAT_R32G32_USCALED,
  77    PIPE_FORMAT_R32G32B32_USCALED,
  78    PIPE_FORMAT_R32G32B32A32_USCALED
  79 };
  80
  81 static GLuint int_types_norm[4] = {
  82    PIPE_FORMAT_R32_SNORM,
  83    PIPE_FORMAT_R32G32_SNORM,
  84    PIPE_FORMAT_R32G32B32_SNORM,
  85    PIPE_FORMAT_R32G32B32A32_SNORM
  86 };
  87
  88 static GLuint int_types_scale[4] = {
  89    PIPE_FORMAT_R32_SSCALED,
  90    PIPE_FORMAT_R32G32_SSCALED,
  91    PIPE_FORMAT_R32G32B32_SSCALED,
  92    PIPE_FORMAT_R32G32B32A32_SSCALED
  93 };
  94
  95 static GLuint ushort_types_norm[4] = {
  96    PIPE_FORMAT_R16_UNORM,
  97    PIPE_FORMAT_R16G16_UNORM,
  98    PIPE_FORMAT_R16G16B16_UNORM,
  99    PIPE_FORMAT_R16G16B16A16_UNORM
 100 };
 101
 102 static GLuint ushort_types_scale[4] = {
 103    PIPE_FORMAT_R16_USCALED,
 104    PIPE_FORMAT_R16G16_USCALED,
 105    PIPE_FORMAT_R16G16B16_USCALED,
 106    PIPE_FORMAT_R16G16B16A16_USCALED
 107 };
 108
 109 static GLuint short_types_norm[4] = {
 110    PIPE_FORMAT_R16_SNORM,
 111    PIPE_FORMAT_R16G16_SNORM,
 112    PIPE_FORMAT_R16G16B16_SNORM,
 113    PIPE_FORMAT_R16G16B16A16_SNORM
 114 };
 115
 116 static GLuint short_types_scale[4] = {
 117    PIPE_FORMAT_R16_SSCALED,
 118    PIPE_FORMAT_R16G16_SSCALED,
 119    PIPE_FORMAT_R16G16B16_SSCALED,
 120    PIPE_FORMAT_R16G16B16A16_SSCALED
 121 };
 122
 123 static GLuint ubyte_types_norm[4] = {
 124    PIPE_FORMAT_R8_UNORM,
 125    PIPE_FORMAT_R8G8_UNORM,
 126    PIPE_FORMAT_R8G8B8_UNORM,
 127    PIPE_FORMAT_R8G8B8A8_UNORM
 128 };
 129
 130 static GLuint ubyte_types_scale[4] = {
 131    PIPE_FORMAT_R8_USCALED,
 132    PIPE_FORMAT_R8G8_USCALED,
 133    PIPE_FORMAT_R8G8B8_USCALED,
 134    PIPE_FORMAT_R8G8B8A8_USCALED
 135 };
 136
 137 static GLuint byte_types_norm[4] = {
 138    PIPE_FORMAT_R8_SNORM,
 139    PIPE_FORMAT_R8G8_SNORM,
 140    PIPE_FORMAT_R8G8B8_SNORM,
 141    PIPE_FORMAT_R8G8B8A8_SNORM
 142 };
 143
 144 static GLuint byte_types_scale[4] = {
 145    PIPE_FORMAT_R8_SSCALED,
 146    PIPE_FORMAT_R8G8_SSCALED,
 147    PIPE_FORMAT_R8G8B8_SSCALED,
 148    PIPE_FORMAT_R8G8B8A8_SSCALED
 149 };
 150
 151 static GLuint fixed_types[4] = {
 152    PIPE_FORMAT_R32_FIXED,
 153    PIPE_FORMAT_R32G32_FIXED,
 154    PIPE_FORMAT_R32G32B32_FIXED,
 155    PIPE_FORMAT_R32G32B32A32_FIXED
 156 };
 157
 158
 159
 160 /**
 161  * Return a PIPE_FORMAT_x for the given GL datatype and size.
 162  */
 163 static GLuint
 164 pipe_vertex_format(GLenum type, GLuint size, GLboolean normalized)
 165 {
 166    assert((type >= GL_BYTE && type <= GL_DOUBLE) ||
 167           type == GL_FIXED);
 168    assert(size >= 1);
 169    assert(size <= 4);
 170
 171    if (normalized) {
 172       switch (type) {
 173       case GL_DOUBLE: return double_types[size-1];
 174       case GL_FLOAT: return float_types[size-1];
 175       case GL_INT: return int_types_norm[size-1];
 176       case GL_SHORT: return short_types_norm[size-1];
 177       case GL_BYTE: return byte_types_norm[size-1];
 178       case GL_UNSIGNED_INT: return uint_types_norm[size-1];
 179       case GL_UNSIGNED_SHORT: return ushort_types_norm[size-1];
 180       case GL_UNSIGNED_BYTE: return ubyte_types_norm[size-1];
 181       case GL_FIXED: return fixed_types[size-1];
 182       default: assert(0); return 0;
 183       }
 184    }
 185    else {
 186       switch (type) {
 187       case GL_DOUBLE: return double_types[size-1];
 188       case GL_FLOAT: return float_types[size-1];
 189       case GL_INT: return int_types_scale[size-1];
 190       case GL_SHORT: return short_types_scale[size-1];
 191       case GL_BYTE: return byte_types_scale[size-1];
 192       case GL_UNSIGNED_INT: return uint_types_scale[size-1];
 193       case GL_UNSIGNED_SHORT: return ushort_types_scale[size-1];
 194       case GL_UNSIGNED_BYTE: return ubyte_types_scale[size-1];
 195       case GL_FIXED: return fixed_types[size-1];
 196       default: assert(0); return 0;
 197       }
 198    }
 199    return 0; /* silence compiler warning */
 200 }
 201
 202
 203 /*
 204  * If edge flags are needed, setup an bitvector of flags and call
 205  * pipe->set_edgeflags().
 206  * XXX memleak: need to free the returned pointer at some point
 207  */
 208 static void *
 209 setup_edgeflags(GLcontext *ctx, GLenum primMode, GLint start, GLint count,
 210                 const struct gl_client_array *array)
 211 {
 212    struct pipe_context *pipe = ctx->st->pipe;
 213
 214    if ((primMode == GL_TRIANGLES ||
 215         primMode == GL_QUADS ||
 216         primMode == GL_POLYGON) &&
 217        (ctx->Polygon.FrontMode != GL_FILL ||
 218         ctx->Polygon.BackMode != GL_FILL)) {
 219       /* need edge flags */
 220       GLint i;
 221       unsigned *vec;
 222       struct st_buffer_object *stobj = st_buffer_object(array->BufferObj);
 223       ubyte *map;
 224
 225       if (!stobj)
 226          return NULL;
 227
 228       vec = (unsigned *) calloc(sizeof(unsigned), (count + 31) / 32);
 229       if (!vec)
 230          return NULL;
 231
 232       map = pipe_buffer_map(pipe->screen, stobj->buffer, PIPE_BUFFER_USAGE_CPU_READ);
 233       map = ADD_POINTERS(map, array->Ptr);
 234
 235       for (i = 0; i < count; i++) {
 236          if (*((float *) map))
 237             vec[i/32] |= 1 << (i % 32);
 238
 239          map += array->StrideB;
 240       }
 241
 242       pipe_buffer_unmap(pipe->screen, stobj->buffer);
 243
 244       pipe->set_edgeflags(pipe, vec);
 245
 246       return vec;
 247    }
 248    else {
 249       /* edge flags not needed */
 250       pipe->set_edgeflags(pipe, NULL);
 251       return NULL;
 252    }
 253 }
 254
 255
 256 /**
 257  * Examine the active arrays to determine if we have interleaved
 258  * vertex arrays all living in one VBO, or all living in user space.
 259  * \param userSpace  returns whether the arrays are in user space.
 260  */
 261 static GLboolean
 262 is_interleaved_arrays(const struct st_vertex_program *vp,
 263                       const struct gl_client_array **arrays,
 264                       GLboolean *userSpace)
 265 {
 266    GLuint attr;
 267    const struct gl_buffer_object *firstBufObj = NULL;
 268    GLint firstStride = -1;
 269    GLuint num_client_arrays = 0;
 270    const GLubyte *client_addr = NULL;
 271
 272    for (attr = 0; attr < vp->num_inputs; attr++) {
 273       const GLuint mesaAttr = vp->index_to_input[attr];
 274       const struct gl_buffer_object *bufObj = arrays[mesaAttr]->BufferObj;
 275       const GLsizei stride = arrays[mesaAttr]->StrideB; /* in bytes */
 276
 277       if (firstStride < 0) {
 278          firstStride = stride;
 279       }
 280       else if (firstStride != stride) {
 281          return GL_FALSE;
 282       }
 283
 284       if (!bufObj || !bufObj->Name) {
 285          num_client_arrays++;
 286          /* Try to detect if the client-space arrays are
 287           * "close" to each other.
 288           */
 289          if (!client_addr) {
 290             client_addr = arrays[mesaAttr]->Ptr;
 291          }
 292          else if (abs(arrays[mesaAttr]->Ptr - client_addr) > firstStride) {
 293             /* arrays start too far apart */
 294             return GL_FALSE;
 295          }
 296       }
 297       else if (!firstBufObj) {
 298          firstBufObj = bufObj;
 299       }
 300       else if (bufObj != firstBufObj) {
 301          return GL_FALSE;
 302       }
 303    }
 304
 305    *userSpace = (num_client_arrays == vp->num_inputs);
 306    /*printf("user space: %d\n", (int) *userSpace);*/
 307
 308    return GL_TRUE;
 309 }
 310
 311
 312 /**
 313  * Once we know all the arrays are in user space, this function
 314  * computes the memory range occupied by the arrays.
 315  */
 316 static void
 317 get_user_arrays_bounds(const struct st_vertex_program *vp,
 318                        const struct gl_client_array **arrays,
 319                        GLuint max_index,
 320                        const GLubyte **low, const GLubyte **high)
 321 {
 322    const GLubyte *low_addr = NULL;
 323    GLuint attr;
 324    GLint stride;
 325
 326    for (attr = 0; attr < vp->num_inputs; attr++) {
 327       const GLuint mesaAttr = vp->index_to_input[attr];
 328       const GLubyte *start = arrays[mesaAttr]->Ptr;
 329       stride = arrays[mesaAttr]->StrideB;
 330       if (attr == 0) {
 331          low_addr = start;
 332       }
 333       else {
 334          low_addr = MIN2(low_addr, start);
 335       }
 336    }
 337
 338    *low = low_addr;
 339    *high = low_addr + (max_index + 1) * stride;
 340 }
 341
 342
 343 /**
 344  * Set up for drawing interleaved arrays that all live in one VBO
 345  * or all live in user space.
 346  * \param vbuffer  returns vertex buffer info
 347  * \param velements  returns vertex element info
 348  */
 349 static void
 350 setup_interleaved_attribs(GLcontext *ctx,
 351                           const struct st_vertex_program *vp,
 352                           const struct gl_client_array **arrays,
 353                           GLuint max_index,
 354                           GLboolean userSpace,
 355                           struct pipe_vertex_buffer *vbuffer,
 356                           struct pipe_vertex_element velements[])
 357 {
 358    struct pipe_context *pipe = ctx->st->pipe;
 359    GLuint attr;
 360    const GLubyte *offset0;
 361
 362    for (attr = 0; attr < vp->num_inputs; attr++) {
 363       const GLuint mesaAttr = vp->index_to_input[attr];
 364       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 365       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 366       GLsizei stride = arrays[mesaAttr]->StrideB;
 367
 368       /*printf("stobj %u = %p\n", attr, (void*)stobj);*/
 369
 370       if (attr == 0) {
 371          if (userSpace) {
 372             const GLubyte *low, *high;
 373             get_user_arrays_bounds(vp, arrays, max_index, &low, &high);
 374             /*printf("user buffer range: %p %p  %d\n", low, high, high-low);*/
 375             vbuffer->buffer =
 376                pipe_user_buffer_create(pipe->screen, (void *) low, high - low);
 377             vbuffer->buffer_offset = 0;
 378             offset0 = low;
 379          }
 380          else {
 381             vbuffer->buffer = NULL;
 382             pipe_buffer_reference(pipe->screen, &vbuffer->buffer, stobj->buffer);
 383             vbuffer->buffer_offset = (unsigned) arrays[mesaAttr]->Ptr;
 384             offset0 = arrays[mesaAttr]->Ptr;
 385          }
 386          vbuffer->pitch = stride; /* in bytes */
 387          vbuffer->max_index = max_index;
 388       }
 389
 390       velements[attr].src_offset =
 391          (unsigned) (arrays[mesaAttr]->Ptr - offset0);
 392       velements[attr].vertex_buffer_index = 0;
 393       velements[attr].nr_components = arrays[mesaAttr]->Size;
 394       velements[attr].src_format =
 395          pipe_vertex_format(arrays[mesaAttr]->Type,
 396                             arrays[mesaAttr]->Size,
 397                             arrays[mesaAttr]->Normalized);
 398       assert(velements[attr].src_format);
 399    }
 400 }
 401
 402
 403 /**
 404  * Set up a separate pipe_vertex_buffer and pipe_vertex_element for each
 405  * vertex attribute.
 406  * \param vbuffer  returns vertex buffer info
 407  * \param velements  returns vertex element info
 408  */
 409 static void
 410 setup_non_interleaved_attribs(GLcontext *ctx,
 411                               const struct st_vertex_program *vp,
 412                               const struct gl_client_array **arrays,
 413                               GLuint max_index,
 414                               struct pipe_vertex_buffer vbuffer[],
 415                               struct pipe_vertex_element velements[])
 416 {
 417    struct pipe_context *pipe = ctx->st->pipe;
 418    GLuint attr;
 419
 420    for (attr = 0; attr < vp->num_inputs; attr++) {
 421       const GLuint mesaAttr = vp->index_to_input[attr];
 422       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 423       GLsizei stride = arrays[mesaAttr]->StrideB;
 424
 425       if (bufobj && bufobj->Name) {
 426          /* Attribute data is in a VBO.
 427           * Recall that for VBOs, the gl_client_array->Ptr field is
 428           * really an offset from the start of the VBO, not a pointer.
 429           */
 430          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 431          assert(stobj->buffer);
 432          /*printf("stobj %u = %p\n", attr, (void*) stobj);*/
 433
 434          vbuffer[attr].buffer = NULL;
 435          pipe_buffer_reference(pipe->screen, &vbuffer[attr].buffer, stobj->buffer);
 436          vbuffer[attr].buffer_offset = (unsigned) arrays[mesaAttr]->Ptr;
 437          velements[attr].src_offset = 0;
 438       }
 439       else {
 440          /* attribute data is in user-space memory, not a VBO */
 441          uint bytes;
 442          /*printf("user-space array %d stride %d\n", attr, stride);*/
 443
 444          /* wrap user data */
 445          if (arrays[mesaAttr]->Ptr) {
 446             /* user's vertex array */
 447             if (arrays[mesaAttr]->StrideB) {
 448                bytes = arrays[mesaAttr]->StrideB * (max_index + 1);
 449             }
 450             else {
 451                bytes = arrays[mesaAttr]->Size
 452                   * _mesa_sizeof_type(arrays[mesaAttr]->Type);
 453             }
 454             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 455                            (void *) arrays[mesaAttr]->Ptr, bytes);
 456          }
 457          else {
 458             /* no array, use ctx->Current.Attrib[] value */
 459             bytes = sizeof(ctx->Current.Attrib[0]);
 460             vbuffer[attr].buffer = pipe_user_buffer_create(pipe->screen,
 461                            (void *) ctx->Current.Attrib[mesaAttr], bytes);
 462             stride = 0;
 463          }
 464
 465          vbuffer[attr].buffer_offset = 0;
 466          velements[attr].src_offset = 0;
 467       }
 468
 469       assert(velements[attr].src_offset <= 2048); /* 11-bit field */
 470
 471       /* common-case setup */
 472       vbuffer[attr].pitch = stride; /* in bytes */
 473       vbuffer[attr].max_index = max_index;
 474       velements[attr].vertex_buffer_index = attr;
 475       velements[attr].nr_components = arrays[mesaAttr]->Size;
 476       velements[attr].src_format
 477          = pipe_vertex_format(arrays[mesaAttr]->Type,
 478                               arrays[mesaAttr]->Size,
 479                               arrays[mesaAttr]->Normalized);
 480       assert(velements[attr].src_format);
 481    }
 482 }
 483
 484
 485
 486
 487 /**
 488  * This function gets plugged into the VBO module and is called when
 489  * we have something to render.
 490  * Basically, translate the information into the format expected by gallium.
 491  */
 492 void
 493 st_draw_vbo(GLcontext *ctx,
 494             const struct gl_client_array **arrays,
 495             const struct _mesa_prim *prims,
 496             GLuint nr_prims,
 497             const struct _mesa_index_buffer *ib,
 498             GLuint min_index,
 499             GLuint max_index)
 500 {
 501    struct pipe_context *pipe = ctx->st->pipe;
 502    const struct st_vertex_program *vp;
 503    const struct pipe_shader_state *vs;
 504    struct pipe_vertex_buffer vbuffer[PIPE_MAX_SHADER_INPUTS];
 505    GLuint attr;
 506    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 507    unsigned num_vbuffers, num_velements;
 508    GLboolean userSpace;
 509
 510    /* sanity check for pointer arithmetic below */
 511    assert(sizeof(arrays[0]->Ptr[0]) == 1);
 512
 513    st_validate_state(ctx->st);
 514
 515    /* must get these after state validation! */
 516    vp = ctx->st->vp;
 517    vs = &ctx->st->vp->state;
 518
 519    /*
 520     * Setup the vbuffer[] and velements[] arrays.
 521     */
 522    if (is_interleaved_arrays(vp, arrays, &userSpace)) {
 523       /*printf("Draw interleaved\n");*/
 524       setup_interleaved_attribs(ctx, vp, arrays, max_index, userSpace,
 525                                 vbuffer, velements);
 526       num_vbuffers = 1;
 527       num_velements = vp->num_inputs;
 528       if (num_velements == 0)
 529          num_vbuffers = 0;
 530    }
 531    else {
 532       /*printf("Draw non-interleaved\n");*/
 533       setup_non_interleaved_attribs(ctx, vp, arrays, max_index,
 534                                     vbuffer, velements);
 535       num_vbuffers = vp->num_inputs;
 536       num_velements = vp->num_inputs;
 537    }
 538
 539 #if 0
 540    {
 541       GLuint i;
 542       for (i = 0; i < num_vbuffers; i++) {
 543          printf("buffers[%d].pitch = %u\n", i, vbuffer[i].pitch);
 544          printf("buffers[%d].max_index = %u\n", i, vbuffer[i].max_index);
 545          printf("buffers[%d].buffer_offset = %u\n", i, vbuffer[i].buffer_offset);
 546          printf("buffers[%d].buffer = %p\n", i, (void*) vbuffer[i].buffer);
 547       }
 548       for (i = 0; i < num_velements; i++) {
 549          printf("vlements[%d].vbuffer_index = %u\n", i, velements[i].vertex_buffer_index);
 550          printf("vlements[%d].src_offset = %u\n", i, velements[i].src_offset);
 551          printf("vlements[%d].nr_comps = %u\n", i, velements[i].nr_components);
 552          printf("vlements[%d].format = %s\n", i, pf_name(velements[i].src_format));
 553       }
 554    }
 555 #endif
 556
 557    pipe->set_vertex_buffers(pipe, num_vbuffers, vbuffer);
 558    pipe->set_vertex_elements(pipe, num_velements, velements);
 559
 560    /* do actual drawing */
 561    if (ib) {
 562       /* indexed primitive */
 563       struct gl_buffer_object *bufobj = ib->obj;
 564       struct pipe_buffer *indexBuf = NULL;
 565       unsigned indexSize, indexOffset, i;
 566
 567       switch (ib->type) {
 568       case GL_UNSIGNED_INT:
 569          indexSize = 4;
 570          break;
 571       case GL_UNSIGNED_SHORT:
 572          indexSize = 2;
 573          break;
 574       case GL_UNSIGNED_BYTE:
 575          indexSize = 1;
 576          break;
 577       default:
 578          assert(0);
 579          return;
 580       }
 581
 582       /* get/create the index buffer object */
 583       if (bufobj && bufobj->Name) {
 584          /* elements/indexes are in a real VBO */
 585          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 586          pipe_buffer_reference(pipe->screen, &indexBuf, stobj->buffer);
 587          indexOffset = (unsigned) ib->ptr / indexSize;
 588       }
 589       else {
 590          /* element/indicies are in user space memory */
 591          indexBuf = pipe_user_buffer_create(pipe->screen, (void *) ib->ptr,
 592                                             ib->count * indexSize);
 593          indexOffset = 0;
 594       }
 595
 596       /* draw */
 597       if (nr_prims == 1 && pipe->draw_range_elements != NULL) {
 598          i = 0;
 599
 600          /* XXX: exercise temporary path to pass min/max directly
 601           * through to driver & draw module.  These interfaces still
 602           * need a bit of work...
 603           */
 604          setup_edgeflags(ctx, prims[i].mode,
 605                          prims[i].start + indexOffset, prims[i].count,
 606                          arrays[VERT_ATTRIB_EDGEFLAG]);
 607
 608          pipe->draw_range_elements(pipe, indexBuf, indexSize,
 609                                    min_index,
 610                                    max_index,
 611                                    prims[i].mode,
 612                                    prims[i].start + indexOffset, prims[i].count);
 613       }
 614       else {
 615          for (i = 0; i < nr_prims; i++) {
 616             setup_edgeflags(ctx, prims[i].mode,
 617                             prims[i].start + indexOffset, prims[i].count,
 618                             arrays[VERT_ATTRIB_EDGEFLAG]);
 619
 620             pipe->draw_elements(pipe, indexBuf, indexSize,
 621                                 prims[i].mode,
 622                                 prims[i].start + indexOffset, prims[i].count);
 623          }
 624       }
 625
 626       pipe_buffer_reference(pipe->screen, &indexBuf, NULL);
 627    }
 628    else {
 629       /* non-indexed */
 630       GLuint i;
 631       for (i = 0; i < nr_prims; i++) {
 632          setup_edgeflags(ctx, prims[i].mode,
 633                          prims[i].start, prims[i].count,
 634                          arrays[VERT_ATTRIB_EDGEFLAG]);
 635
 636          pipe->draw_arrays(pipe, prims[i].mode, prims[i].start, prims[i].count);
 637       }
 638    }
 639
 640    /* unreference buffers (frees wrapped user-space buffer objects) */
 641    for (attr = 0; attr < num_vbuffers; attr++) {
 642       pipe_buffer_reference(pipe->screen, &vbuffer[attr].buffer, NULL);
 643       assert(!vbuffer[attr].buffer);
 644    }
 645    pipe->set_vertex_buffers(pipe, vp->num_inputs, vbuffer);
 646 }
 647
 648
 649 #if FEATURE_feedback || FEATURE_drawpix
 650
 651 /**
 652  * Set the (private) draw module's post-transformed vertex format when in
 653  * GL_SELECT or GL_FEEDBACK mode or for glRasterPos.
 654  */
 655 static void
 656 set_feedback_vertex_format(GLcontext *ctx)
 657 {
 658 #if 0
 659    struct st_context *st = ctx->st;
 660    struct vertex_info vinfo;
 661    GLuint i;
 662
 663    memset(&vinfo, 0, sizeof(vinfo));
 664
 665    if (ctx->RenderMode == GL_SELECT) {
 666       assert(ctx->RenderMode == GL_SELECT);
 667       vinfo.num_attribs = 1;
 668       vinfo.format[0] = FORMAT_4F;
 669       vinfo.interp_mode[0] = INTERP_LINEAR;
 670    }
 671    else {
 672       /* GL_FEEDBACK, or glRasterPos */
 673       /* emit all attribs (pos, color, texcoord) as GLfloat[4] */
 674       vinfo.num_attribs = st->state.vs->cso->state.num_outputs;
 675       for (i = 0; i < vinfo.num_attribs; i++) {
 676          vinfo.format[i] = FORMAT_4F;
 677          vinfo.interp_mode[i] = INTERP_LINEAR;
 678       }
 679    }
 680
 681    draw_set_vertex_info(st->draw, &vinfo);
 682 #endif
 683 }
 684
 685
 686 /**
 687  * Called by VBO to draw arrays when in selection or feedback mode and
 688  * to implement glRasterPos.
 689  * This is very much like the normal draw_vbo() function above.
 690  * Look at code refactoring some day.
 691  * Might move this into the failover module some day.
 692  */
 693 void
 694 st_feedback_draw_vbo(GLcontext *ctx,
 695                      const struct gl_client_array **arrays,
 696                      const struct _mesa_prim *prims,
 697                      GLuint nr_prims,
 698                      const struct _mesa_index_buffer *ib,
 699                      GLuint min_index,
 700                      GLuint max_index)
 701 {
 702    struct st_context *st = ctx->st;
 703    struct pipe_context *pipe = st->pipe;
 704    struct draw_context *draw = st->draw;
 705    const struct st_vertex_program *vp;
 706    const struct pipe_shader_state *vs;
 707    struct pipe_buffer *index_buffer_handle = 0;
 708    struct pipe_vertex_buffer vbuffers[PIPE_MAX_SHADER_INPUTS];
 709    struct pipe_vertex_element velements[PIPE_MAX_ATTRIBS];
 710    GLuint attr, i;
 711    ubyte *mapped_constants;
 712
 713    assert(draw);
 714
 715    st_validate_state(ctx->st);
 716
 717    /* must get these after state validation! */
 718    vp = ctx->st->vp;
 719    vs = &st->vp->state;
 720
 721    if (!st->vp->draw_shader) {
 722       st->vp->draw_shader = draw_create_vertex_shader(draw, vs);
 723    }
 724
 725    /*
 726     * Set up the draw module's state.
 727     *
 728     * We'd like to do this less frequently, but the normal state-update
 729     * code sends state updates to the pipe, not to our private draw module.
 730     */
 731    assert(draw);
 732    draw_set_viewport_state(draw, &st->state.viewport);
 733    draw_set_clip_state(draw, &st->state.clip);
 734    draw_set_rasterizer_state(draw, &st->state.rasterizer);
 735    draw_bind_vertex_shader(draw, st->vp->draw_shader);
 736    set_feedback_vertex_format(ctx);
 737
 738    /* loop over TGSI shader inputs to determine vertex buffer
 739     * and attribute info
 740     */
 741    for (attr = 0; attr < vp->num_inputs; attr++) {
 742       const GLuint mesaAttr = vp->index_to_input[attr];
 743       struct gl_buffer_object *bufobj = arrays[mesaAttr]->BufferObj;
 744       void *map;
 745
 746       if (bufobj && bufobj->Name) {
 747          /* Attribute data is in a VBO.
 748           * Recall that for VBOs, the gl_client_array->Ptr field is
 749           * really an offset from the start of the VBO, not a pointer.
 750           */
 751          struct st_buffer_object *stobj = st_buffer_object(bufobj);
 752          assert(stobj->buffer);
 753
 754          vbuffers[attr].buffer = NULL;
 755          pipe_buffer_reference(pipe->screen, &vbuffers[attr].buffer, stobj->buffer);
 756          vbuffers[attr].buffer_offset = (unsigned) arrays[0]->Ptr;/* in bytes */
 757          velements[attr].src_offset = arrays[mesaAttr]->Ptr - arrays[0]->Ptr;
 758       }
 759       else {
 760          /* attribute data is in user-space memory, not a VBO */
 761          uint bytes = (arrays[mesaAttr]->Size
 762                        * _mesa_sizeof_type(arrays[mesaAttr]->Type)
 763                        * (max_index + 1));
 764
 765          /* wrap user data */
 766          vbuffers[attr].buffer
 767             = pipe_user_buffer_create(pipe->screen, (void *) arrays[mesaAttr]->Ptr,
 768                                       bytes);
 769          vbuffers[attr].buffer_offset = 0;
 770          velements[attr].src_offset = 0;
 771       }
 772
 773       /* common-case setup */
 774       vbuffers[attr].pitch = arrays[mesaAttr]->StrideB; /* in bytes */
 775       vbuffers[attr].max_index = max_index;
 776       velements[attr].vertex_buffer_index = attr;
 777       velements[attr].nr_components = arrays[mesaAttr]->Size;
 778       velements[attr].src_format = pipe_vertex_format(arrays[mesaAttr]->Type,
 779                                                arrays[mesaAttr]->Size,
 780                                                arrays[mesaAttr]->Normalized);
 781       assert(velements[attr].src_format);
 782
 783       /* tell draw about this attribute */
 784 #if 0
 785       draw_set_vertex_buffer(draw, attr, &vbuffer[attr]);
 786 #endif
 787
 788       /* map the attrib buffer */
 789       map = pipe_buffer_map(pipe->screen, vbuffers[attr].buffer,
 790                             PIPE_BUFFER_USAGE_CPU_READ);
 791       draw_set_mapped_vertex_buffer(draw, attr, map);
 792    }
 793
 794    draw_set_vertex_buffers(draw, vp->num_inputs, vbuffers);
 795    draw_set_vertex_elements(draw, vp->num_inputs, velements);
 796
 797    if (ib) {
 798       unsigned indexSize;
 799       struct gl_buffer_object *bufobj = ib->obj;
 800       struct st_buffer_object *stobj = st_buffer_object(bufobj);
 801       void *map;
 802
 803       index_buffer_handle = stobj->buffer;
 804
 805       switch (ib->type) {
 806       case GL_UNSIGNED_INT:
 807          indexSize = 4;
 808          break;
 809       case GL_UNSIGNED_SHORT:
 810          indexSize = 2;
 811          break;
 812       default:
 813          assert(0);
 814          return;
 815       }
 816
 817       map = pipe_buffer_map(pipe->screen, index_buffer_handle,
 818                             PIPE_BUFFER_USAGE_CPU_READ);
 819       draw_set_mapped_element_buffer(draw, indexSize, map);
 820    }
 821    else {
 822       /* no index/element buffer */
 823       draw_set_mapped_element_buffer(draw, 0, NULL);
 824    }
 825
 826
 827    /* map constant buffers */
 828    mapped_constants = pipe_buffer_map(pipe->screen,
 829                                       st->state.constants[PIPE_SHADER_VERTEX].buffer,
 830                                       PIPE_BUFFER_USAGE_CPU_READ);
 831    draw_set_mapped_constant_buffer(st->draw, mapped_constants,
 832                                    st->state.constants[PIPE_SHADER_VERTEX].buffer->size);
 833
 834
 835    /* draw here */
 836    for (i = 0; i < nr_prims; i++) {
 837       draw_arrays(draw, prims[i].mode, prims[i].start, prims[i].count);
 838    }
 839
 840
 841    /* unmap constant buffers */
 842    pipe_buffer_unmap(pipe->screen, st->state.constants[PIPE_SHADER_VERTEX].buffer);
 843
 844    /*
 845     * unmap vertex/index buffers
 846     */
 847    for (i = 0; i < PIPE_MAX_ATTRIBS; i++) {
 848       if (draw->pt.vertex_buffer[i].buffer) {
 849          pipe_buffer_unmap(pipe->screen, draw->pt.vertex_buffer[i].buffer);
 850          pipe_buffer_reference(pipe->screen, &draw->pt.vertex_buffer[i].buffer, NULL);
 851          draw_set_mapped_vertex_buffer(draw, i, NULL);
 852       }
 853    }
 854    if (ib) {
 855       pipe_buffer_unmap(pipe->screen, index_buffer_handle);
 856       draw_set_mapped_element_buffer(draw, 0, NULL);
 857    }
 858 }
 859
 860 #endif /* FEATURE_feedback || FEATURE_drawpix */
 861
 862
 863 void st_init_draw( struct st_context *st )
 864 {
 865    GLcontext *ctx = st->ctx;
 866
 867    vbo_set_draw_func(ctx, st_draw_vbo);
 868 }
 869
 870
 871 void st_destroy_draw( struct st_context *st )
 872 {
 873 }
 874
 875